登录流程已全部重构

lib/widgets/ui_kit/utils/enums/ui_theme.dart

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+// 主题风格
+enum UiThemeType {
+  primary,
+  success,
+  warning,
+  danger,
+}

lib/widgets/ui_kit/utils/enums/ui_variant.dart

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+//定义Variant
+enum UiVariant {
+  solid,
+  plain,
+}

lib/widgets/ui_kit/utils/theme/ui_color.dart

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+import 'package:flutter/material.dart';
+import 'package:food_health/config/theme/base/app_theme_ext.dart';
+
+import '../enums/ui_theme.dart';
+import '../enums/ui_variant.dart';
+
+class UiColorScheme {
+  final Color background;
+  final Color foreground;
+
+  UiColorScheme({
+    required this.background,
+    required this.foreground,
+  });
+}
+
+class UiColor {
+  static UiColorScheme getColorScheme(
+    BuildContext context, {
+    UiThemeType type = UiThemeType.primary,
+    UiVariant variant = UiVariant.solid,
+  }) {
+    final colorScheme = Theme.of(context).colorScheme;
+    final themeExt = Theme.of(context).extension<AppThemeExtension>()!;
+
+    //主题色映射
+    final baseColor = switch (type) {
+      UiThemeType.primary => colorScheme.primary,
+      UiThemeType.success => themeExt.success,
+      UiThemeType.warning => themeExt.warning,
+      UiThemeType.danger => themeExt.danger,
+    };
+
+    // 风格区分
+    return switch (variant) {
+      UiVariant.solid => UiColorScheme(
+        background: baseColor,
+        foreground: Colors.white,
+      ),
+      UiVariant.plain => UiColorScheme(
+        background: baseColor.withValues(alpha: 0.3),
+        foreground: baseColor,
+      ),
+    };
+  }
+}